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POCore data relationship lost after fetching more objects into the entities
 

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  1. POCore data relationship lost after fetching more objects into the entities
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    <p>I have a core data model that looks like this.</p> <p><img src="https://i.stack.imgur.com/lWA0E.png" alt="enter image description here"></p> <p>Inside a tableview I load up all my appointments. On a <code>UILabel</code> inside my <code>custom cell</code> I set the appointments location name as follows.</p> <pre><code>NSString *info = appointment.location.label_vrij; </code></pre> <p>At first everything works Oké, but when I load more appointments into my <code>database</code>. All the info strings goes <code>NULL</code>. After some debugging I noticed that also <code>appointment.location</code> returns <code>NULL</code>.</p> <p>This is how my NSFetchRequest looks like</p> <pre><code>RKManagedObjectStore *store = [[SanMaxDataModel sharedDataModel] objectStore]; NSManagedObjectContext *context = store.mainQueueManagedObjectContext; NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"Appointment"]; NSString *relationshipKeyPath = @"location"; // Set this to the name of the relationship on "A" that points to the "B" objects; NSArray *keyPaths = [NSArray arrayWithObject:relationshipKeyPath]; [fetchRequest setRelationshipKeyPathsForPrefetching:keyPaths]; NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"dateStart" ascending:YES]; fetchRequest.sortDescriptors = @[descriptor]; NSPredicate *predicate = [NSPredicate predicateWithFormat: @"tijd_dag = %@",strDate]; [fetchRequest setPredicate:predicate]; NSArray *matches = [context executeFetchRequest:fetchRequest error:nil]; appointments = [matches mutableCopy]; </code></pre> <p>So I think my relationship is just messed up ?</p> <p><strong>EDIT</strong></p> <p>I'm using Restkit for mapping my appointments into my core database. From the comments below I decided to turn off the option flag off the location attribute inside the Appointment entity. Because an appointment should always have a location. </p> <p>Now when I load up the first day. Everything works oké. But when i try to load up the next day , I get the error: <code>The operation couldn\U2019t be completed. (Cocoa error 1570.)</code> Now when I take a look at the detailed Error</p> <pre><code>DetailedError: { NSLocalizedDescription = "The operation couldn\U2019t be completed. (Cocoa error 1570.)"; NSValidationErrorKey = location; NSValidationErrorObject = "&lt;Appointment: 0x864e2f0&gt; (entity: Appointment; id: 0x9272c70 &lt;x-coredata://9692683D-3077-4362-9253-652AC5B36444/Appointment/p9&gt; ; data: {\n autouur = 1;\n breekuur = 0;\n data1 = \"\";\n data2 = \"\";\n data3 = \"\";\n data4 = \"\";\n data5 = \"\";\n data6 = \"\";\n data7 = \"\";\n data8 = \"\";\n data9 = \"\";\n dateStart = \"2013-10-23 09:00:00 +0000\";\n dateStop = \"2013-10-23 09:30:00 +0000\";\n duration = 30;\n email = \"\";\n entryID = 774294984959;\n info = \"\";\n \"is_blocked\" = 0;\n \"is_except\" = 0;\n \"is_free\" = 1;\n \"is_moved\" = 0;\n \"is_vert\" = 0;\n locatieID = 773150;\n location = nil;\n multiID = nil;\n serverEntryID = 774294984959;\n serverLocatieID = 773150;\n sms = \"\";\n \"tijd_dag\" = 20131023;\n \"tijd_uur\" = 900;\n})"; } </code></pre> <p>This is how I load up the JSON in core data</p> <pre><code>-(void)getAppointmentsForDate:(NSString *)date forUserID:(NSString *)userID{ API *api = [API new]; RKManagedObjectStore *store = [[SanMaxDataModel sharedDataModel] objectStore]; NSLog(@"store is %@",store); NSManagedObjectContext *context = store.mainQueueManagedObjectContext; RKObjectManager *objectManager = [api mapAppointments]; NSString *urlString = [NSString stringWithFormat:@"/doctor/1.0/json/nl/appointments/get-by-date/apikey/%@?uid=%@&amp;date=%@",APIKey,userID,date]; // NSString *urlString = [NSString stringWithFormat:@"/doctor/1.0/json/nl/appointments/get-by-date/apikey/%@?uid=77382&amp;date=%@",APIKey,date]; NSURLRequest *request = [objectManager requestWithObject:nil method:RKRequestMethodGET path:urlString parameters:nil]; RKManagedObjectRequestOperation *operation = [objectManager managedObjectRequestOperationWithRequest:request managedObjectContext:context success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) { NSLog(@"TILL HERE IN METHOD"); NSError *error = nil; [[NSNotificationCenter defaultCenter] postNotificationName:@"appointmentsLoaded" object:self]; [[SanMaxDataModel sharedDataModel] saveToPersistentStoreAsync:&amp;error]; } failure:^(RKObjectRequestOperation *operation, NSError *error) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:[error localizedDescription] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; NSLog(@"Hit error: %@", error); }]; [objectManager enqueueObjectRequestOperation:operation]; } </code></pre>
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    1. This table or related slice is empty.
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    1. COHow do you load more appointments? Could you post that code? And, are you making sure to `save:` the managed object context after inserting new managed objects or making any changes in core data?
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    2. COI save everywhere, when I change something.
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    3. COIf the problem occurs after you load more appointments, the problem may be when you're loading them. Something else may be going on there.
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      1. USsalo.dm
 

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